Here are three techniques for men (especially if you are stocking fetishists!)
SIX STEPS TO HEAVEN
Tie six knots, about an inch apart, in a nylon stocking. Lubricate your anus and push the knots up inside, past the sphincter muscle. Masturbate however you wish, but with your free hand hold on to the dangling end of the stocking. As you start to cum pull out the knots one by one. Coinciding with the muscular spasms of your ejaculation, the sensation is incredible and your orgasm will seem to last much longer than normal.
For uncircumsised men. Pull back your foreskin to expose the glans. Take the leg of a pair of pantyhose, or a nylon stocking and stretch it between your hands so you have a flat band of nylon. Keeping it taut, rub it up and down the edge of your glans,right or left side. Alternatively you can rub it up and down or across your frenum. It's so intense it's like torture. You won't necessarily cum, but your feelings should be intense. I tried it and started to tremble violently. Eventually I had to give up and stroke myself furiously until I came really hard. I would love to hear any stories if you try this one.
NYLON TRIGGER SHEATH
Take a nylon knee-sock (Pop Socks in the UK, but there must be a US equivalent) or a stocking. Put it over your cock, pulling the foreskin all the way back. Holding your shaft so the foreskin doesn't move forward, with the other hand pull the toe of the stocking away from the tip of your cock and stretch it up, pulling it up and down so the nylon rubs all all around your glans. You need to be very patient, but watching your cum splattering into the nylon is really excting. And if you can't cum like this, just finish yourself off with the hand holding thestocking on the shaft. Thinking about your favourite woman wearing stockings and blasting into the nylon will definitely do it for you, if you like hosiery at all.